Vulnerability report

Exploited in the wild High confidence Not in CISA KEV

CVE-2026-32255

kan Is Vulnerable to Unauthenticated SSRF Server-Side Request Forgery

Kanbn / kan · affected before 0.5.5

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Severity
CVSS 8.6 · High
Confidence
High
Exploit status
Exploited in the wild
EPSS
1.7%
First observed
—
Last observed
—

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2026-32255 is an unauthenticated vulnerability affecting Kanbn kan. Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no...

Is it exploited?

Yes. Previdian tracks this CVE as a known exploited vulnerability. Confidence is high. Also confirmed by third-party sources.

Who is affected?

Kanbn / kan affected before 0.5.5.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Kan is an open-source project management tool

Kan is an open-source project management tool. In versions 0.5.4 and below, the /api/download/attatchment endpoint has no authentication and no URL validation. The Attachment Download endpoint accepts a user-supplied URL query parameter and passes it directly to fetch() server-side, and returns the full response body.

An unauthenticated attacker can use this to make HTTP requests from the server to internal services, cloud metadata endpoints, or private network resources. This issue has been fixed in version 0.5.5. To workaround this issue, block or restrict access to /api/download/attatchment at the reverse proxy level (nginx, Cloudflare, etc.).

kanbn Affected
kan
Before 0.5.5
Published
18 Mar 2026
Exploitation Reported
17 Sep 2026
Attack vector
Remote
Complexity
Low
Privileges
None
User interaction
None

Tags

nginx nuclei_scanner

CVE References

Exploitation evidence

Why Previdian marks this CVE as exploited

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploited in the wild

The Shadowserver

Recorded 17 Sep 2026

A trusted third party reported exploitation.

Proof of concept available

Nuclei Templates

Recorded 19 Aug 2026

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

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Source Added
The Shadowserver First 2026-09-17 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts
0
0
0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner Reference Detected
Nuclei https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2026/CVE-2026-32255.yaml 19 Aug 2026

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

8.6 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

EPSS

1.7%

Weaknesses

Server-Side Request Forgery (SSRF) CWE-918

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

Kan <= 0.5.4 - Server-Side Request Forgery

nuclei · Created Unknown

Timeline

From disclosure to observed exploitation

  1. 00:00 UTC

    Added to Previdian KEV Feed

    High-confidence, third-party attested exploitation

  2. 04:30 UTC

    Public PoC available

    Public proof-of-concept code published

  3. 04:30 UTC

    Nuclei template available

    Scanner coverage available

  4. 23:11 UTC

    CVE published

    Vulnerability disclosed publicly

  5. 15:05 UTC

    CVE ID reserved

    Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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  • Evidence confidence and provenance
  • First-party sensor telemetry
  • PoC and scanner references
  • Affected versions and enrichment
  • Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2026-32255

Free JSON includes basic KEV fields 
{
  "cve_id": "CVE-2026-32255",
  "confidence": "High",
  "cvss_score": 8.6,
  "cvss_estimated": false,
  "epss_score": 0.01744,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}